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Altera_Forum's avatar
Altera_Forum
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16 years ago

Clock group vs. clock false path

I have a couple of clocks coming in that are not related to each other. Before I put them in a group, I ran TimeQuest and it was complaining about some setup slack violation. I know I should have u...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
16 years ago

kaz, that makes a lot of sense. funny you mention it, I have a reset signal that changes very rarely that is also causing some timing issues. A false path there should solve that issue - the reset signal is valid for multiple cycles of the slowest clock.

rbugalho, I have a number of clocks in the system and no matter what they are (even 1:1 plls), I don't trust their relationships and I either double flop or use dcfifo for CDC. Would I still be lying to TimeQuest if I put all those clocks in groups?